Blood viscosity varies in different physiological and patholegical conditions, as well as among races. This is due to differences in its major determinants, namely, the haematocrit, plasma fibrinogen and serum immunoglobulins. We measured whole blood, plasma fibrinogen and serum immunoglogulins. We measured whole blood, plasma and serum viscosities, as well as their determinants, namely, the haematocrit, plasma fibrinogen concentration and serum 1gM and 1gG titres in 30 non-pregnant Jamaicans. This study reports the blood viscosity values for apparently healthy, non-pregnant Jamaicans.....read more